A new type of very low frequency sinusoidal waveform generator

The very low frequency (VLF) testing equipment has been widely used in recent years due to its portability. A new type of VLF sinusoidal waveform generator which can be used for withstand voltage testing of power cables id presented. The equipment consists of a bipolar charging circuit, a discharging circuit, a polarity conversion switch, a resistance voltage divide and the control system, and the key to generate VLF sinusoidal waveform is hysteresis control technology. An experiment platform is built in the laboratory, and the result shows that this generator can generator a sinusoidal waveform at 0.1 Hz whose total harmonic distortion can meet the requirement of IEEE 400.2 standard and national standard, and its feasibility and effectiveness are proed. (from magazine Electrotechnical Application 6/2019 on theoretical analysis.)



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